Cell mimetic monolayer supported chitosan-haemocompatibility studies.

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Biomedical Engineering

Background:

• Chitosan, a natural polymer, is extensively studied for biomedical applications.
• Chitosan's thrombogenic nature restricts its use in blood-contacting devices.
• Improving chitosan hemocompatibility is crucial for advanced medical implants.

Purpose of the Study:

• To enhance the hemocompatibility of chitosan films.
• To investigate the effect of cell-mimetic lipid monolayers on chitosan surface properties.
• To assess the blood-cell interaction and calcification potential of modified chitosan.

Main Methods:

• Lipid monolayer (phosphatidylcholine/cholesterol/galactocerebroside) deposition onto chitosan films.
• Surface characterization using sessile drop contact angle measurements.
• In vitro calcification studies and hemocompatibility assessment with blood cells (platelets, leukocytes, erythrocytes).
• Morphological analysis of platelet adhesion and activation via scanning electron microscopy.

Main Results:

• Surface modification significantly reduced the contact angle of chitosan films.
• The lipid monolayer decreased overall blood cell adhesion and platelet activation.
• Bare chitosan surfaces showed significant platelet activation, while modified surfaces did not.
• In vitro calcification studies revealed increased calcification on the lipid-modified chitosan surfaces.

Conclusions:

• Cell-mimetic lipid monolayers can improve chitosan hemocompatibility by reducing blood cell adhesion and platelet activation.
• The swelling of chitosan influences lipid monolayer organization.
• The enhanced chitosan surfaces exhibit increased susceptibility to calcification, posing a challenge for long-term implantation.
• Further research is needed to mitigate calcification for effective use in blood-contacting biomedical applications.